package main

import (
	"os"
	"path/filepath"
	"reflect"
	"testing"
)

// module writes modules/<name>/module.json with one image artifact from `from`, and the files named.
func module(t *testing.T, root, name, from string, files ...string) {
	t.Helper()
	dir := filepath.Join(root, "modules", name)
	if err := os.MkdirAll(dir, 0o755); err != nil {
		t.Fatal(err)
	}
	body := `{"module":"` + name + `","build":{"artifacts":[{"name":"server","kind":"image","from":"` + from + `"},{"name":"files","kind":"archive","from":"../elsewhere"}]}}`
	if err := os.WriteFile(filepath.Join(dir, "module.json"), []byte(body), 0o644); err != nil {
		t.Fatal(err)
	}
	for _, f := range files {
		p := filepath.Join(dir, f)
		if err := os.MkdirAll(filepath.Dir(p), 0o755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(p, []byte("FROM scratch\n"), 0o644); err != nil {
			t.Fatal(err)
		}
	}
}

func TestADockerfileInTheModulesOwnDirectoryPasses(t *testing.T) {
	root := t.TempDir()
	module(t, root, "own", "Dockerfile", "Dockerfile")
	module(t, root, "nested", "image/Dockerfile", "image/Dockerfile")
	got, err := Check(root)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 0 {
		t.Errorf("found %v, want none", got)
	}
}

func TestADockerfileOutsideTheModulesDirectoryFails(t *testing.T) {
	root := t.TempDir()
	module(t, root, "other", "Dockerfile", "Dockerfile")
	module(t, root, "leaves", "../other/Dockerfile")
	module(t, root, "absolute", "/etc/Dockerfile")
	got, err := Check(root)
	if err != nil {
		t.Fatal(err)
	}
	var mods []string
	for _, f := range got {
		mods = append(mods, f.Module)
	}
	if want := []string{"absolute", "leaves"}; !reflect.DeepEqual(mods, want) {
		t.Errorf("refused %v (%v), want %v", mods, got, want)
	}
}

func TestAMissingDockerfileFails(t *testing.T) {
	root := t.TempDir()
	module(t, root, "gone", "Dockerfile")
	got, err := Check(root)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 1 || got[0].Module != "gone" {
		t.Errorf("found %v, want gone refused", got)
	}
}

// The catalogue as it stands: this is the check itself, run here too.
func TestTheCataloguesImagesBuildFromTheirOwnDirectories(t *testing.T) {
	got, err := Check("../..")
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 0 {
		t.Errorf("an image builds from outside its module: %v", got)
	}
}